Public bug reported:

The following was originally noticed while trying to use Lmod, but can
be reproduced with the standalone Lua interpreter. Lmod has worked fine
earlier in the alpha, this behaviour is new within the last bunch of
days.

lars@mononoke:~$ lsb_release -rd
Description:    Ubuntu Bionic Beaver (development branch)
Release:        18.04

lars@mononoke:~$ lua5.2 <<< 'require("posix")'
lua5.2: /usr/share/lua/5.2/posix/init.lua:29: module 'posix.ctype' not found:
        no field package.preload['posix.ctype']
        no file '/usr/local/share/lua/5.2/posix/ctype.lua'
        no file '/usr/local/share/lua/5.2/posix/ctype/init.lua'
        no file '/usr/local/lib/lua/5.2/posix/ctype.lua'
        no file '/usr/local/lib/lua/5.2/posix/ctype/init.lua'
        no file '/usr/share/lua/5.2/posix/ctype.lua'
        no file '/usr/share/lua/5.2/posix/ctype/init.lua'
        no file './posix/ctype.lua'
        no file '/usr/local/lib/lua/5.2/posix/ctype.so'
        no file '/usr/lib/x86_64-linux-gnu/lua/5.2/posix/ctype.so'
        no file '/usr/lib/lua/5.2/posix/ctype.so'
        no file '/usr/local/lib/lua/5.2/loadall.so'
        no file './posix/ctype.so'
        no file '/usr/local/lib/lua/5.2/posix.so'
        no file '/usr/lib/x86_64-linux-gnu/lua/5.2/posix.so'
        no file '/usr/lib/lua/5.2/posix.so'
        no file '/usr/local/lib/lua/5.2/loadall.so'
        no file './posix.so'
stack traceback:
        [C]: in function 'require'
        /usr/share/lua/5.2/posix/init.lua:29: in main chunk
        [C]: in function 'require'
        stdin:1: in main chunk
        [C]: in ?

lars@mononoke:~$ dpkg -l lua-posix
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                        Version            Architecture       
Description
+++-===========================-==================-==================-============================================================
ii  lua-posix:amd64             33.4.0-2           amd64              posix 
library for the Lua language
ii  lua5.2                      5.2.4-1.1build1    amd64              Simple, 
extensible, embeddable programming language

lars@mononoke:~$ dpkg -L lua-posix
/.
/usr
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu/liblua5.1-posix.so.1.0.0
/usr/lib/x86_64-linux-gnu/liblua5.2-posix.so.1.0.0
/usr/lib/x86_64-linux-gnu/liblua5.3-posix.so.1.0.0
/usr/lib/x86_64-linux-gnu/lua
/usr/lib/x86_64-linux-gnu/lua/5.1
/usr/lib/x86_64-linux-gnu/lua/5.2
/usr/lib/x86_64-linux-gnu/lua/5.3
/usr/share
/usr/share/doc
/usr/share/doc/lua-posix
/usr/share/doc/lua-posix/changelog.Debian.gz
/usr/share/doc/lua-posix/copyright
/usr/share/lintian
/usr/share/lintian/overrides
/usr/share/lintian/overrides/lua-posix
/usr/share/lua
/usr/share/lua/5.1
/usr/share/lua/5.1/posix
/usr/share/lua/5.1/posix/_argcheck.lua
/usr/share/lua/5.1/posix/compat.lua
/usr/share/lua/5.1/posix/deprecated.lua
/usr/share/lua/5.1/posix/init.lua
/usr/share/lua/5.1/posix/sys.lua
/usr/share/lua/5.1/posix/util.lua
/usr/share/lua/5.2
/usr/share/lua/5.2/posix
/usr/share/lua/5.3
/usr/share/lua/5.3/posix
/usr/lib/x86_64-linux-gnu/liblua5.1-posix.so.1
/usr/lib/x86_64-linux-gnu/liblua5.2-posix.so.1
/usr/lib/x86_64-linux-gnu/liblua5.3-posix.so.1
/usr/lib/x86_64-linux-gnu/lua/5.1/posix_c.so
/usr/lib/x86_64-linux-gnu/lua/5.2/posix_c.so
/usr/lib/x86_64-linux-gnu/lua/5.3/posix_c.so
/usr/share/lua/5.2/posix/_argcheck.lua
/usr/share/lua/5.2/posix/compat.lua
/usr/share/lua/5.2/posix/deprecated.lua
/usr/share/lua/5.2/posix/init.lua
/usr/share/lua/5.2/posix/sys.lua
/usr/share/lua/5.2/posix/util.lua
/usr/share/lua/5.3/posix/_argcheck.lua
/usr/share/lua/5.3/posix/compat.lua
/usr/share/lua/5.3/posix/deprecated.lua
/usr/share/lua/5.3/posix/init.lua
/usr/share/lua/5.3/posix/sys.lua
/usr/share/lua/5.3/posix/util.lua

** Affects: lua-posix (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1752082

Title:
  importing posix in Lua 5.2 on bionic fails to load posix.ctype

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